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Dr. Naghelli Ortega-Avila
Cátedra CONACYT in Centro de Investigación en Materiales Avanzados, S.C.

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Research Keywords & Expertise

0 Renewable Energy
0 Thermal Analysis
0 Heat integration
0 Heat transfer, heat exchanger
0 Solar energy conversion

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Journal article
Published: 13 February 2020 in Sustainability
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The energy market in Mexico is facing changes due to the incorporation of clean energy certificates (CEL) on the Electric Industry Law (LIE, Ley de la Industria Electrica). One of the aims is to increase the percentage of clean energy use in the national energy matrix. Consequently, the integration of energy efficiency strategies prior to the incorporation of renewables has become essential at different levels. Industrial buildings have significant heat gains and losses through the envelope, mainly due to their vast surface and simple construction systems. This work analyses the typical envelopes of industrial buildings in Mexico and the effect of industrial rooftop photovoltaic (PV) systems over the annual energy consumption. It was found that for temperate climates, the best option would be to insulate the roof. For cities with warm climates, the best approach is to implement a cool roof on a non-insulated layer or to simply insulate the roof. Additionally, the industrial buildings with metallic roofs situated in warmer climates would benefit the most from the implementation of rooftop PV systems. After all, the results point out that the decrease in the required CELs would not influence the savings.

ACS Style

Carlos A. Espino-Reyes; Naghelli Ortega-Avila; Norma A. Rodriguez-Muñoz. Energy Savings on an Industrial Building in Different Climate Zones: Envelope Analysis and PV System Implementation. Sustainability 2020, 12, 1391 .

AMA Style

Carlos A. Espino-Reyes, Naghelli Ortega-Avila, Norma A. Rodriguez-Muñoz. Energy Savings on an Industrial Building in Different Climate Zones: Envelope Analysis and PV System Implementation. Sustainability. 2020; 12 (4):1391.

Chicago/Turabian Style

Carlos A. Espino-Reyes; Naghelli Ortega-Avila; Norma A. Rodriguez-Muñoz. 2020. "Energy Savings on an Industrial Building in Different Climate Zones: Envelope Analysis and PV System Implementation." Sustainability 12, no. 4: 1391.

Journal article
Published: 27 November 2019 in Acta Universitaria
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Four different shapes of a 182 m2 research greenhouse were analyzed using dynamic simulations. The thermal performance was evaluated using different cover materials at an equal floor area. In developing countries, the selection of the greenhouse shape, structure, and cover material generally is made based on the availability of the materials and considering the initial investment costs. The greenhouse is located on a cold semi-arid (BSk) climate according to the Köppen climate classification. This study aimed to determine the best choice of the greenhouse shape and cover material according to a technical-economic analysis. The analysis was conducted from a technical-economic perspective for this specific climate region. The results show the heating and cooling energy consumption for different cover materials and greenhouse shapes. The economic analysis was made to assess the investment and operative costs through the life span of the greenhouse.

ACS Style

Juan Carlos Barragán-Medrano; Norma Alejandra Rodríguez Muñoz; Mario Najera-Trejo; Jorge Alberto Escobedo-Bretado; Ignacio Ramiro Martin-Domínguez; Eduardo Venegas-Reyes; Naghelli Ortega-Ávila. Analysis of a greenhouse thermal performance using dynamic simulations. Acta Universitaria 2019, 29, 1 -15.

AMA Style

Juan Carlos Barragán-Medrano, Norma Alejandra Rodríguez Muñoz, Mario Najera-Trejo, Jorge Alberto Escobedo-Bretado, Ignacio Ramiro Martin-Domínguez, Eduardo Venegas-Reyes, Naghelli Ortega-Ávila. Analysis of a greenhouse thermal performance using dynamic simulations. Acta Universitaria. 2019; 29 ():1-15.

Chicago/Turabian Style

Juan Carlos Barragán-Medrano; Norma Alejandra Rodríguez Muñoz; Mario Najera-Trejo; Jorge Alberto Escobedo-Bretado; Ignacio Ramiro Martin-Domínguez; Eduardo Venegas-Reyes; Naghelli Ortega-Ávila. 2019. "Analysis of a greenhouse thermal performance using dynamic simulations." Acta Universitaria 29, no. : 1-15.

Journal article
Published: 17 May 2019 in Processes
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The analysis of solar thermal systems through numerical simulation is of great importance, since it allows predicting the performance of many configurations in any location and under different climatic conditions. Most of the simulation tools are commercial and require different degrees of training; therefore, it is important to develop simple and reliable methodologies to obtain similar results. This study presents a parametric methodology to size stationary solar collector fields, with operating temperatures up to 150 °C. The costs of the collector loop piping and the pumping power of different series–parallel arrays is considered. The proposed tool was validated with experimental data and through simulations using commercial software. The tool allows establishing series–parallel arrays and calculates the volume of the storage tank according to the thermal load. The calculation is based on the system energy balance, where the mass flow and the heat losses in the interconnections of the collectors are taken into account. The number of collectors and the optimal series–parallel array were determined. The results show deviations lower than 7% in the relative error of the temperature profiles and in the solar fraction, with respect to the results obtained by dynamic simulations.

ACS Style

Eduardo Venegas-Reyes; Naghelli Ortega-Avila; Norma A. Rodríguez-Muñoz; Mario Nájera-Trejo; Ignacio R. Martín-Domínguez; Jonathan Ibarra-Bahena. Parametric Methodology to Optimize the Sizing of Solar Collector Fields in Series-Parallel Arrays. Processes 2019, 7, 294 .

AMA Style

Eduardo Venegas-Reyes, Naghelli Ortega-Avila, Norma A. Rodríguez-Muñoz, Mario Nájera-Trejo, Ignacio R. Martín-Domínguez, Jonathan Ibarra-Bahena. Parametric Methodology to Optimize the Sizing of Solar Collector Fields in Series-Parallel Arrays. Processes. 2019; 7 (5):294.

Chicago/Turabian Style

Eduardo Venegas-Reyes; Naghelli Ortega-Avila; Norma A. Rodríguez-Muñoz; Mario Nájera-Trejo; Ignacio R. Martín-Domínguez; Jonathan Ibarra-Bahena. 2019. "Parametric Methodology to Optimize the Sizing of Solar Collector Fields in Series-Parallel Arrays." Processes 7, no. 5: 294.

Journal article
Published: 01 November 2018 in Environments
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In Mexico, residents of low income housing mainly achieve thermal comfort through mechanical ventilation and electrical air conditioning systems. Though government and private efforts have risen to meet an increasing demand for social housing, the average construction quality and thermal comfort of new housing stock has decreased over the years. Various programs and regulations have been implemented to address these concerns, including the 2011 residential building standard NOM-020-ENER-2011. This standard attempts to limit heat gains in residential buildings, in order to reduce the energy consumption required from cooling systems, and was intended to be applied throughout Mexico. NOM-020-ENER-2011, however, divides the country into just four climatic zones and only considers the energy use of cooling systems, disregarding heating costs. The recommendations of this policy are thus inadequate for the many regions in Mexico that have mild to moderate winters. This study discusses the assumptions and calculations that underlie NOM-020-ENER-2011, identifying several problems and recommending specific changes to the standard that would lead to greater comfort and lower energy use throughout Mexico.

ACS Style

Ignacio R. Martin-Dominguez; Norma A. Rodriguez-Muñoz; Claudia K. Romero-Perez; Mario Najera-Trejo; Naghelli Ortega-Avila. Analysis of the Methodologic Assumptions of the NOM-020-ENER-2011—Mexican Residential Building Standard. Environments 2018, 5, 118 .

AMA Style

Ignacio R. Martin-Dominguez, Norma A. Rodriguez-Muñoz, Claudia K. Romero-Perez, Mario Najera-Trejo, Naghelli Ortega-Avila. Analysis of the Methodologic Assumptions of the NOM-020-ENER-2011—Mexican Residential Building Standard. Environments. 2018; 5 (11):118.

Chicago/Turabian Style

Ignacio R. Martin-Dominguez; Norma A. Rodriguez-Muñoz; Claudia K. Romero-Perez; Mario Najera-Trejo; Naghelli Ortega-Avila. 2018. "Analysis of the Methodologic Assumptions of the NOM-020-ENER-2011—Mexican Residential Building Standard." Environments 5, no. 11: 118.

Journal article
Published: 01 January 2014 in Energy Procedia
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A solar concentrator was designed using a detailed one-dimensional numerical model previously developed to describe the heat and fluid-dynamic behavior inside a compound parabolic concentrator (CPC). The governing equations (continuity, momentum and energy) inside the CPC absorber tube, together with the energy equation in the tube wall and the thermal analysis in the solar concentrator were solved.Two CPC geometries were proposed based on numerical simulation and commercial availability of materials; one of this is tested in this work.A ray tracing analysis was made for this configuration to quantify optical energy losses due to truncation. Then, a module with aperture area of 2.1 m2 was constructed. The module has 12 CPCs, each one with real concentration ratio of 1.8, acceptance angle of 30°, and a tubular receiver covered by a selective surface.An experimental setup was designed and built to test different operational conditions for the module; for example mass flow rate and inlet temperature. The experimental setup has the following elements: The CPC, two water storage tanks, a recirculation pump, and a support structure that allows positioning the CPC at different angles.Experimental results obtained using the Mexican standard NMX-ES-001-NORMEX-2005 show that this technology could be able to supply stable temperatures for industrial processes. However, a new prototype is going to be developed and constructed in order to improve some manufacturing errors detected in these experimental tests

ACS Style

I. Santos-González; M. Sandoval-Reyes; O. García-Valladares; N. Ortega; V.H. Gómez. Design and Evaluation of a Compound Parabolic Concentrator for Heat Generation of Thermal Processes. Energy Procedia 2014, 57, 2956 -2965.

AMA Style

I. Santos-González, M. Sandoval-Reyes, O. García-Valladares, N. Ortega, V.H. Gómez. Design and Evaluation of a Compound Parabolic Concentrator for Heat Generation of Thermal Processes. Energy Procedia. 2014; 57 ():2956-2965.

Chicago/Turabian Style

I. Santos-González; M. Sandoval-Reyes; O. García-Valladares; N. Ortega; V.H. Gómez. 2014. "Design and Evaluation of a Compound Parabolic Concentrator for Heat Generation of Thermal Processes." Energy Procedia 57, no. : 2956-2965.

Research article
Published: 03 June 2011 in International Journal of Energy Research
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The numerical simulation and experimental validation of a compound parabolic concentrator (CPC) are presented. The solar device had an aperture area of 1.33 m2, a real concentration ratio of 3.5, an acceptance half angle of 15°, and a carbon steel (or aluminum) tubular receiver with an outer diameter of 0.0603 m and coated with a commercial selective surface. Experimental tests were performed using water as working fluid at solar noon; the inlet temperatures used varied from 30 °C to 70 °C and the mass flow rates from 0.05 kg/s to 0.25 kg/s. A comparison of the experimental results with the numerical model developed was carried out. The results of the thermal efficiency, outlet temperature, and pressure drop were compared and found to be in close agreement with the experimental data. Therefore, the model is a reliable tool for the design and optimization of compound parabolic concentrators. Because the numerical model is based on the application of physical laws, it is possible to extrapolate its use with confidence to other fluids, mixtures, and operating conditions. Copyright © 2011 John Wiley & Sons, Ltd.

ACS Style

I. Santos-González; Naghelli Ortega-Avila; V. H. Gómez; O. García-Valladares; R. Best. Development and experimental investigation of a compound parabolic concentrator. International Journal of Energy Research 2011, 36, 1151 -1160.

AMA Style

I. Santos-González, Naghelli Ortega-Avila, V. H. Gómez, O. García-Valladares, R. Best. Development and experimental investigation of a compound parabolic concentrator. International Journal of Energy Research. 2011; 36 (12):1151-1160.

Chicago/Turabian Style

I. Santos-González; Naghelli Ortega-Avila; V. H. Gómez; O. García-Valladares; R. Best. 2011. "Development and experimental investigation of a compound parabolic concentrator." International Journal of Energy Research 36, no. 12: 1151-1160.

Journal article
Published: 01 September 2008 in Renewable Energy
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ACS Style

Naghelli Ortega-Avila; O. García-Valladares; R. Best; V.H. Gómez. Two-phase flow modelling of a solar concentrator applied as ammonia vapor generator in an absorption refrigerator. Renewable Energy 2008, 33, 2064 -2076.

AMA Style

Naghelli Ortega-Avila, O. García-Valladares, R. Best, V.H. Gómez. Two-phase flow modelling of a solar concentrator applied as ammonia vapor generator in an absorption refrigerator. Renewable Energy. 2008; 33 (9):2064-2076.

Chicago/Turabian Style

Naghelli Ortega-Avila; O. García-Valladares; R. Best; V.H. Gómez. 2008. "Two-phase flow modelling of a solar concentrator applied as ammonia vapor generator in an absorption refrigerator." Renewable Energy 33, no. 9: 2064-2076.

Journal article
Published: 30 April 1999 in Renewable Energy
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In this paper a review of solar cooling and refrigeration technologies is presented. A discussion on the main reasons why these technologies are not presently economically feasible is carried out. and two installations in Mexico are analysed.

ACS Style

R. Best; N. Ortega. Solar refrigeration and cooling. Renewable Energy 1999, 16, 685 -690.

AMA Style

R. Best, N. Ortega. Solar refrigeration and cooling. Renewable Energy. 1999; 16 (1):685-690.

Chicago/Turabian Style

R. Best; N. Ortega. 1999. "Solar refrigeration and cooling." Renewable Energy 16, no. 1: 685-690.